文献类型：期刊文献

中文题名：干旱半干旱地区植被覆盖度的动态变化分析——以毛乌素沙漠南部为例

英文题名：Dynamic change of desertification in semi-arid and arid environment

作者：成军锋[1] 贾宝全[2] 赵秀海[1] 康秀亮[1]

第一作者：成军锋

机构：[1]北京林业大学林学院;[2]中国林业科学研究院林业研究所

年份：2009

卷号：23

期号：12

起止页码：172-176

中文期刊名：干旱区资源与环境

外文期刊名：Journal of Arid Land Resources and Environment

收录：北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；CSSCI:【CSSCI_E2008_2009】；

语种：中文

中文关键词：植被覆盖度;NDVI;荒漠化指数;格局指数

外文关键词：Desertification index ; NDVI ; vegetation coverage fraction ; pattern index

分类号：Q948

摘要：采用1991年8月、1999年8月、2004年8月三景Landsat卫星遥感数据,计算其植被覆盖度值,并根据荒漠化程度对其进行分类,分别是:无荒漠化(fc>0.6)、轻度荒漠化(0.3Desertification is a serious problem in north China. Selecting 3 sceneries of Landsat TM image in Aug 1991, Aug 2000 and Aug. 200 4 in south of Mu Us Sand land and based on NDVI ,the grade maps of desertification were extracted. The desertification grade is divided into four types ： non - desertification （ fc 〉 0.6）, slight desertificlation（0.3 〈 fc 〈 0.6 ）, moderate desertification （0.1 〈 fc 〈 0.3 ）, severe desertification （fe 〈 0.1 ）. In addition ,analysis of desertification area statistics, transfer matrix, pattern index and desertification index showed that desertification grade is decreasing in the study stage, for that the desertification index reduces from 0.37 in 1991 to O. 31 in 2004 ,and that severe desertification has transformed into non -desertification, slight desertification and moderate desertification. There are two reasons for vegetation improvement in south of Mu Us sand land, one is climate factor such as precipitation and evaporation, and another is artificial factor such as converting cropland to forests, closing and fencing and discontinuing farming and letting go out of cultivation .